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Weird behaviour of SHIFT

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Whenever I press SHIFT in twitter message form, or on forms of some other sites (but not in this form), I get weird behaviour, like:

  • removal of the previous symbol, or
  • acts like i pressed HOME, or
  • does not type the symbol at all.

GIFs are attached (in twitter):

  • in one of them I literally type <write SHIFT> but get only <write F>
  • in another I type <press """"">

(ignore symbols < and >)

This behaviour is in *safe* mode already. Related is this unanswered reddit thread: https://www.reddit.com/r/firefox/comments/7jdmll/firefox_57_issue_shift_key_deleting_text/

Chrome works perfectly; ~one year ago, firefox worked perfectly.

Firefox Quantum 61.0.1 (64-bit), Ubuntu 16.04, T420 thinkpad laptop.

Whenever I press SHIFT in twitter message form, or on forms of some other sites (but not in this form), I get weird behaviour, like: * removal of the previous symbol, or * acts like i pressed HOME, or * does not type the symbol at all. GIFs are attached (in twitter): * in one of them I literally type <write SHIFT> but get only <write F> * in another I type <press """""> (ignore symbols < and >) This behaviour is in *safe* mode already. Related is this unanswered reddit thread: https://www.reddit.com/r/firefox/comments/7jdmll/firefox_57_issue_shift_key_deleting_text/ Chrome works perfectly; ~one year ago, firefox worked perfectly. Firefox Quantum 61.0.1 (64-bit), Ubuntu 16.04, T420 thinkpad laptop.
Attached screenshots

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All Replies (4)

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Start Firefox in Safe Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration is is causing the problem.

  • switch to the DEFAULT theme: "3-bar" menu button or Tools -> Add-ons -> Appearance
  • do NOT click the "Refresh Firefox" button on the Safe Mode start window

Try the Firefox version from the official Mozilla server if you currently use a version from the repositories of your Linux distribution.

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As I wrote in the original post, I tried the safe mode.

I just now tried the default theme (in safe mode) and a latest version from the server you mentioned.

The same problem.

I also tried a new keyboard, the problem persists.

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Too bad that SHIFT works fine in Chrome, otherwise we could blame it on your device (not necessarily the keyboard, but the motherboard) .....

See these search results

Question : Does SHIFT behave the same way on the on-screen keyboard  ?

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Thanks for reply. Yes, on-screen keyboard produces the same results. Just recorded the video of the twitter form. The same for right-shift. CAPS lock works as expected.

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